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ChangeSet@stripped, 2006-09-26 18:16:37-04:00, cmiller@stripped +1 -0
Bug#21476: (Thread stack overrun not caught, causing SEGV)
The STACK_MIN_SIZE is currently set to 8192, when we actually need
(emperically discovered) 9236 bytes to raise an fatal error, on Ubuntu
Dapper Drake, libc6 2.3.6-0ubuntu2, Linux kernel 2.6.15-27-686, on x86.
I'm taking that as a new lower bound, plus 500B of wiggle-room for sundry
word sizes and stack behaviors.
sql/mysql_priv.h@stripped, 2006-09-26 18:16:35-04:00, cmiller@stripped +8 -1
Increase the amount we require to be available for the stack, since
experience told us that the previous amount was too little by at least
1044 bytes. Add a safety buffer of another 500 bytes to the discovered
# This is a BitKeeper patch. What follows are the unified diffs for the
# set of deltas contained in the patch. The rest of the patch, the part
# that BitKeeper cares about, is below these diffs.
# User: cmiller
# Host: zippy.cornsilk.net
# Root: /home/cmiller/work/mysql/bug21476/my50-bug21476
--- 1.410/sql/mysql_priv.h 2006-09-26 18:16:41 -04:00
+++ 1.411/sql/mysql_priv.h 2006-09-26 18:16:41 -04:00
@@ -131,7 +131,14 @@ MY_LOCALE *my_locale_by_name(const char
#define MAX_ACCEPT_RETRY 10 // Test accept this many times
#define MAX_FIELDS_BEFORE_HASH 32
#define USER_VARS_HASH_SIZE 16
-#define STACK_MIN_SIZE 8192 // Abort if less stack during eval.
+#define STACK_MIN_SIZE 9736 // Abort if less stack during eval.
+ Tested requirement + (arbitrarily chosen) 500 bytes.
+ Discovered through binary search 2006-09-26 on Ubuntu Dapper Drake, libc6
+ 2.3.6-0ubuntu2, Linux kernel 2.6.15-27-686, on x86.
#define STACK_MIN_SIZE_FOR_OPEN 1024*80
#define STACK_BUFF_ALLOC 256 // For stack overrun checks
|• bk commit into 5.0 tree (cmiller:1.2284) BUG#21476||Chad MILLER||27 Sep|